DPGDirk
Full Access Member
- Joined
- Jul 12, 2014
- Posts
- 153
- Reaction score
- 14
Got the '03 Yukon tuned by Justin this past weekend.
Really surprised at all the improvements it made!
Power is definitely up. Not like installing a supercharger, but definitely noticeable.
Shift points are firmer. Will kick down to 2nd gear at any speed below 72mph.
Factory throttle response delay is gone. More responsive.
Engine runs much smoother! Seems like more power with less effort. I looked down at the speedo after the tune figuring I was probably doing 70mph on I-35. I was doing 90MPH!!! It just seemed effortless- like the truck wasn't working hard at all.
Removed the 98mph max speed limit.
The only downside is that my fuel pump is weak and the engine leans out at 5000 RPM's. The pump just can't keep up at that RPM. Gotta replace that asap.
Sux because the truck wants to rev freely to 5900 now, where it didn't have anything left up there before.
Apparently, the factory programs these trucks with numerous slop factors and delays. There is much room for improvement. Nice to have the lifetime tune updates available too for when I add other mods.
Thanks Justin!
Really surprised at all the improvements it made!
Power is definitely up. Not like installing a supercharger, but definitely noticeable.
Shift points are firmer. Will kick down to 2nd gear at any speed below 72mph.
Factory throttle response delay is gone. More responsive.
Engine runs much smoother! Seems like more power with less effort. I looked down at the speedo after the tune figuring I was probably doing 70mph on I-35. I was doing 90MPH!!! It just seemed effortless- like the truck wasn't working hard at all.
Removed the 98mph max speed limit.
The only downside is that my fuel pump is weak and the engine leans out at 5000 RPM's. The pump just can't keep up at that RPM. Gotta replace that asap.
Sux because the truck wants to rev freely to 5900 now, where it didn't have anything left up there before.
Apparently, the factory programs these trucks with numerous slop factors and delays. There is much room for improvement. Nice to have the lifetime tune updates available too for when I add other mods.
Thanks Justin!
